package com.lyj.mode.appearance;

/**
 * 投影仪
 * @author:liyajie
 * @createTime:2022/3/2 14:24
 * @version:1.0
 */
public class Projector {

    private static Projector projector = new Projector();

    private Projector(){}

    public static Projector getInstance(){

        return projector;
    }

    public void on(){
        System.out.println("放下屏幕，打开投影仪");
    }

    public void off(){
        System.out.println("关闭投影仪");
    }

    public void focus(){
        System.out.println("调节投影仪焦距");
    }

    public void zoom(){
        System.out.println("投影仪变焦");
    }

}
